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Lactose intolerance is also called milk intolerance, dairy product intolerance, lactose malabsorption, or milk sugar intolerance. Lactose is a sugar molecule made up of glucose and galactose. It is present in milk and milk-containing products. When the small intestine is deficient in a digestive enzyme named lactase, then the condition arises, referred to as lactose intolerance. If lactase enzyme is not sufficient, then lactose is not broken into simpler sugars, glucose, and galactose, which leaves lactose undigested and causes multiple digestive issues. At the moment, 75% of the world’s population is suffering from lactose intolerance. Lactase deficiency usually develops before the age of 20. The signs and symptoms of lactose malabsorption depend on the amount of lactase produced or the amount of lactose consumed. Some people may be able to digest lactose to some extent, whereas others may have complete intolerance. Lactose intolerance differs from milk allergy, which can result in anaphylaxis.